A really nice game. The atmosphere is very disturbing and the narrow walls give you a sense of surrender and despair right from the start. Just watch out for collisions because sometimes the character gets stuck inside the walls (I recommend enlarging the player's collision capsule). Otherwise, the monster is also well done and its movement logic is very well thought out and creates a lot of anxiety. Congratulations and five stars from me.
If you want, check out my page too. I need some opinions from other creators.
Bye, friend :)